Dishwashing machine



Jan. 3, 1956 w. SMITH, JR 2,729,219

DISHWASHING MACHINE Filed Feb. 19, 1952 5 Sheets-Sheet 1 Fig,

INVENTOR. Will/am Sml'fh Jr.

Jan. 3, 1956 w, rr JR 2,729,219

DISHWASHING MACHINE Filed Feb. 19, 1952 3 Sheets-Sheet 2 H52 Fig. 2 22| 225 249 1 297\/l 299 5 Z 1.11 295 28l 334 g 330 287 Z? 332), L 285 INVENTOR.

I 29M William Smith Jr. 326 243 L Jan. 3, 1956 w M 2,729,219

DISHWASHING MACHINE Filed Feb. 19, 1952 5 Sheets-Sheet 3 0 Motor 297 water Sol. 253 Water 255 Pump Motor 243 57 Solenoid 27 l 4 Dishwushing INVENTOR. William Smith Jr.

United States Patent DISHWASHINGvMAGHlNE a n, Da ton Ohi assi nqr to, era at q Dexte hi9,,. j 9m9rat 0n o Aprsmnhbmam19-,19s2;seriamnrzazsns m (CI-JQ-fik r This invention; relates to-laisdomesticv; appliance and;

washing machine in which food wastes may be; readily washedrotfintltecdi'shes and clisposledof within the machine agatheas ta'r t of thedishwashing operatiom It cisianot'he'r object 0f imy invention-to provide a-dish wasliing machine in which tlfe=sliredder;of=-a food wa'ste disposal-J uriit arid=thewater flow systemare directly; operated 'by a single motor; l

Itis-another 'objeet of -my invention-to providea dis hg washingflmachine im whioli th liquid spra ycircuit; for;- dishwashing-Lis usedalso-' for flashing the fogdf wastedispesal iinit s- These objeets are attained-*byproviding a; diSl'iWaSli-f ing: machine in -which" the-dishwashingchamber is provid'd w-ith an outl'et leacli 1g t'o -a food wastedisppsail unitflhavingawhreddr '--for;'- grii1ding foodgwas tes so that:- thewmayhe readil-y flilshed intothedrain: In one form this shredder connects directly into thepqmp whieh can" discharge the -food' wastes *to the" drain during th e initial par-t offhwwashihg operation and byg a sig'itable; valve the washing liquid--'is -reirqi1lat d -after the food wastes are disposed {of Efrf-addi'tidnal cleaning; of th e dishes; after tlie fodf wastes are disp'osed ofi The shredder an liefpumg are driven-by th'e same, motor-,an'd

upply ahd cirdulating system ar ejlsedjgfor' 1 ingihe-food wastes olf-the diShsand through the f d 55 waste disposal portion."

ln 'a seeondtdrm, asii1glemotor drives the Shleldtil} fc Jr-tlie--disposaL unitand the pump; forf dishwash'ing lflsatedfin Pmte imHit -i Hqw x n t is. water 5 1 12 ,)!"v systriiusd s. Washin f ssalsol us dllf rafiushi i 6Q ing ma in the machine;

' 2,729,219 Rammed/11am 33s 1956 Fig; 2 is; a vertical t-sectional view part-ly--diagnammaticaof anotherform' OfldiShWaShing maCh i-ne in whichaafood waste. disposal unit 7 is :madea part of the"machine;

Fig. 3 is a wiring diagram fonthedishwashingmachineshown in iFigure 2;

figure iis a; chart sliowing-the periodsduringwhit-3h the contacts illustrated in the wiring diagramein'Figure 3' iare closed to secure operation of thevarious-electrician devices controlled by: the: contacts; and

Figure 5 'is: an enlz'irgedview-of the wiring-diagram includi n I 1 '--addl1i 'OIl the cams andcam follower-s oper ated-by the timing motor and the knob for controlli ng; the switeh contaet-s;

Referring new to the d-rawings and I more-particularly to'Eigi' l theredsshown a di'shwashing machine includ? ing anouter shell! 20 within-=-which *thereis provided au-- innershell 22' enclosing adishwashing; chamber 24. This dishwashing chamber is -proVide'd with a door; 26} atthe fronti A-hove th'e outer shell 2tl there; is p o-- vide'd a-tahle'-top= 28 similar in appearance; teotl'ier cabinet's-firovidjed forthe-kitchen: The dishwash'ing machine; inelildes -a-pold Water" supply; source 30controlled-bya-- solenoid operatedvalve- 32 and a hot water supply source -34' control1ed-{by' a-solenoi-d operatedvalve-36. Th'e-=;out=lets of the -valves 32 and --36* are "connectedby' acommon pipe-38- to=a spray"head -40 fastened to" the top of the-inner shell 22 as shown--in"-F,igure- 15 Within" the--dishwasliingcompartment r 24* there'fis provided a: ratclt'MZ fupon=whieh dishes; silverware and pots "andpans may; lieplaced-. The bottom-of fthe inner shell 322*, is' providedWit-hfa sump 44; the" bottom-of whichjs provided with a dijs eharge outle't'46i I The disliesy'silverwareand pptsfand} pans may; be pl a c'd on thefrael42 without being cleaned'or scraped iiifthe-usualmanner Thefdodfupon these dishes, si l-Q vrware -and fppts' andpans is washed: offby the initial; sgray mm the'spray'; head 40' and'washed into the sump; 4:4 and =throiiglr the;-dis :l1a rge-outlet' 4flz- To makfe it pgssible for food waste to b'e; dischargedfdirectlyj into the-drain;- there-is'provided a simplified-'foodjwastm disposal -unift" 48directly-"beneath; the outlet 46 and; in; clndi-fig'a shredder or grinding-element 50shown dia grammaticallyjforgrinding the food wastes into particles of 'siichfisize that'itmay be ppm ped directly to thedrai n The food waste' 'disposalunit -48hiasa centralgoutlet f dis;

I iQ i t t s sritr' f: entr f s i llmp,

sc ts s a n t 6 After the fqqdQ'Wastes are washed;fbfli'1of "the articles iii tl'ie;dishfi'rack 42fand discharged into the discliatgeicon dtlit 6Qthegcoldjfwatersolenoid valve 32. {is deener gj" o; hut fin hq c ld w e ndi ethqt w t rl llc o valve" 315 is;yenergiged to causel hot waten from, the; 421 s ra ed. fmm t e xa :-;ha 1t40' F- l i'nr period ofjtime; After] the,hot,. water has been sprayed-l flt Fh' i i' hlwashin' c amber a 3 ???rlen ihfifl m r to provide an adequate amount of hot, yvaten in l tl elvva'sli'eln.t e sn rat ng Q enQid; 41f Ll WQ1W y. QLVQ GZ QS s zi F mQ i h v l e 1 t P9$ in-c1o i .1 lmt t n u t 6 J d" c u n the s h e con fli 58" -t0 be connected to the vertical conduit 66connecte ingewi-thithe horizontal spray tube68" in the upper p,ortions: oftidis'liwashing chamben 242 The-- motor -56 con? tinuemtos-opetatearecirculating the hot 'washingialiqpid tiy withdrawiitgithezliquidz gfiomsthe sump 44 and '(lis'cH'arging it from the spray tube 68.

Through the second operation the dishes are thoroughly cleaned and sterilized. After this recirculation of hot washing liquid is completed, the solenoid 64 is deenergized to cause the valve 62 to return to its position shown in Fig. 1 so that the discharge from the pump 62 is connected to the drain 60 so as to remove all of the hot washing solution carrying the residue of the material which was on the plates into the drain.

Following this there is a hot water rinse period in which the solenoid valve 36 is opened to spray hot water from the spray head 40 onto the articles on the rack 42 and the solenoid valve 64 is later energized to move the valve 62 to a position closing the drain conduit 60 and recirculating the hot rinse water over the dishes to completely clean and sterilize the dishes. After sufficient hot water has been supplied, the valve 36 is deenergized and the supply of hot water is cut off. Recirculation of the hot rinse water continues until all the residue of the washing liquid and food particles are removed from the dishes. Finally the solenoid valve 64 is deenergized to allow the valve 62 to move back to the position shown in Figure 1 so that the hot rinse water is discharged through the drain conduit 60 to terminate the dishwashing operation.

The dishwashing operation is preferably under the control of a suitable timed electrical control switch means 70 connected with the supply conductors 72. This timed control switch means 70 has an operating knob 74 which makes it possible to start the machine at any point in the operating cycle and also serves to indicate the particular part of the operating cycle of the dishwashing machine which has taken place. The timed control switch 70 controls the supply of electric energy through the conductors 78 to the motor 56. It also controls the supply of electrical energy through the conductors 80 to the solenoid 64. The conductors 82 and 84 connect the timer switch 70 with the respective solenoids of cold water solenoid valve 32 and the hot water solenoid valve 36.

If the dish rack 42 is removed the machine may be used for food waste disposal other than in connection with washing dishes. To do this the food waste merely is dumped into the sump 44 and the knob 74 turned to the starting position for the dishwashing operation. This will cause cold water to be sprayed from the spray head 40 under the control of the solenoid operated valve 42. This will wash the food waste through the outlet 46 into the food waste disposal unit 48. At the same time, the motor 56 is operated which will operate the shredder 50 of the food waste disposal unit 48 to grind the food waste, and the pump 52 will discharge the ground waste through the outlet 58 into the drain conduit 60.

Referring now more particularly to Figure 2, there is shown diagrammatically another form of dishwashing machine including a shell 221 inclosing a dishwashing chamber 223. The top wall of the shell 221 is provided with a liquid spray conduit 225 connecting through the cold water solenoid valve 227 with the cold water supply 229 and through the hot water solenoid valve 231 with the hot water supply 233. The bottom of the shell of the dishwashing compartment 223 is provided with a food waste disposal unit 235 near the door 237 at the front of the compartment 223. The top of the food waste disposal unit 235 is provided with a removable lid 239. At the bottom of the food waste disposal unit 235 there is provided a shredder or grinding element 241 directly connected to the drive shaft of an electric motor 243. The food waste disposal unit 235 is connected at one side adjacent the shredder 241 to an outlet conduit 245 connecting directly with the drain conduit 247.

When dishes with food thereon are to be cleaned they are placed in the dishwashing chamber 223 and the lid 239 is removed. The control knob 249 of the timing electrical control switch 251 is moved to a position wherein the solenoid 253 of the cold water valve 227 is energized to open the valve 227 to wash the food wastes off the dishes into the food waste disposal unit 235. At the same time motor 243 is energized to operate the shredder 241 so that the food wastes are carried into the outlet conduit 245 and the drain conduit 247 to a suitable drain.

After the food wastes are washed from the dishes and other articles to be cleaned in the dishwashing chamber 223, the lid 239 is replaced as shown in Figure 2. The operating knob 249 of the timer controlled switch 251 is moved to a position in which the solenoid 255 is energized to open the hot water valve 231 while the solenoid valve 253 is deenergized to close the cold water valve 227. This flow of hot water continues for a definite period of time under the control of the timer 251. The motor 243 is idle during the initial hot water flow. After a predetermined time interval of hot water flow the timing control switch 251 energizes the solenoid 257 to open the drain valve 259 having its inlet connected at the bottom of the dishwashing chamber 223 and its outlet connected by a conduit 261 to the inlet of a centrifugal pump 263. This pump 263 has its impeller 265 mounted directly on the drive shaft of the motor 243 between the inlet and the shredder 241 of the food waste disposal unit 235. The outlet of the pump 263 is connected by the conduit 267 to the spray tube 269 in the top of the dishwashing chamber 223. The pump 263 circulates hot water through this circuit so that the dishes are provided with a continuous hot water spray for cleansing and spraying the dishes in the dishwashing chamber 223. After the dishes are thoroughly cleaned, the timing control switch 251 energizes the solenoid 271 of the pump outlet disposal valve 273 which connects the second outlet of the pump 263 with the drain discharge conduit 247 to dispose of the hot washing liquid. After the pump 263 has discharged all of the hot washing liquid, the disposal solenoid 271 is deenergized by the timing control switch 251 to close the valve 273.

The timing control switch 251 then energizes the hot water solenoid 255 to open the valve 231 to again supply hot water to the dishwashing chamber 223 while the solenoid 257 is deenergized to close the valve 259. After a sufficient quantity of hot water is provided the solenoid 257 and the motor 243 are again energized to Withdraw hot water from the bottom of the dishwashing chamber 223 past the open valve 259 through the conduit 261 to the inlet of the pump 263. This hot water is discharged through the conduit 267 and sprayed through the spray tube 269 to wash the washing liquid from the dishes and to thoroughly rinse and sterilize the dishes. After rinsing is completed the disposal solenoid 271 is energized by the timing control switch 251 to discharge the hot rinse water into the drain conduit 247 after which the motor is deenergized.

The electrical circuits are shown in Figure 3. The supply conductors are indicated by the reference characters 275 and 277. They connect to a terminal block 279. The supply conductor 277 through the terminal block 279 is connected by the conductor 281 with the line switch 283 which is operated by pushing the knob 249 inwardly to close the switch and outwardly to open this switch 283. This switch 283 connects to a common conductor 285. This common conductor 285 is connected by the motor switch 287 through the conductor 289 and the terminal block 279 to the motor supply conductor 291 which connects to the motor 243. A conductor 293 connects the second terminal of the motor 243 with the supply conductor 275 and the terminal block 279.

The common conductor 285 also connects through the timing motor switch 295 with the electrical timing motor 297 which drives the cams in the timer 251 which operate the various switches shown inside the dash outline designated 251 in Fig. 3. The second terminal of the timing motor 297 is connected by the conductor 299 with the terminal block 279 and the supply conductor 275.

The common conductor 285 is connected by the switch contacts 320 and the conductor 322 with the cold water solenoid 253. The switch contacts 324 connect the comspasms mon conductor 25 through the condu ctor 326 with the hot water solenoid-255i *Theswitclr' contacts 328 connect the. common. conductor. 285 through the conductors 330r'iwithzithetpumpoutlet disposal solenoid 271. Theses:- nid t rminal of the.solenoids 253, 55:.and 271mm 11- neete by. 0mmQn.condJ. $;t0J:. 332 through theztertminal lock 79 .with the. upp y. qndu oxsifiii h wi ch contacts 334 connect the common conductor 285 through the conductor 336 with the solenoid 257 which operates the dishwasher drain valve 259. The second terminal of the solenoid 257 is connected by the conductor 338 with the conductor 299 which connects to the supply conductor 275. This control system is merely given as one example of a control system which might be operated to control a dishwashing machine of either of the types shown in Fig ures l and 2 which will dispose of food wastes as well as wash dishes.

Within the timing control switch 251 the timer motor 297 is connected by an operating shaft 350 with the knob 249. This shaft 350 is rotated either by the timer 297 when it is energized by the electrical circuit or by the knob 249. The shaft 350 has fixed thereon directly behind the knob 249 a pin 352 for moving the switch 283 to closed position when the knob 249 is pushed toward the timer motor 297. This shaft 350 is also provided with a cam 354 provided with a follower 356 forming a part of the switch mechanism 334. This cam has its periphery suitably shaped to close the contacts 334 at the proper times as indicated by the chart Figure 4. On its opposite side the cam 354 is provided with the second follower 358 for closing the motor switch 287. This cam 334 also has a suitably shaped periphery to close the contacts 287 at the proper times as indicated in Figure 4.

The shaft 350 also has fixed thereon a cam 360 operating a follower 362 for controlling the opening and closing of the contacts 328 for controlling the recirculating solenoid 271 as indicated by the chart Figure 4. The shaft 350 also has a third cam 364 fixed thereon having its periphery engaged by a cam follower 366 operably connected to the contacts 320. On its opposite side the cam 364 is engaged by the cam follower 368 for controlling the opening and closing of the contacts 324. The periphery of the cam 364 is so shaped so as to close the contacts 320 and 324 at the proper time as indicated by the chart Figure 4 in order to control the opening of the cold water solenoid 253 and the hot water solenoid 255. The shaft 350 also has fixed thereon the timer cam 370 having a notch thereon for stopping the operation of the timer 297 at the end of the garbage disposing cycle and also at the end of the dishwashing cycle as indicated by the chart Figure 4. The periphery of this cam 370 is contacted by the cam follower 372 for operating the switch 295. If it is desired to omit stopping between the disposal period and the dishwashing period the cam projection 373 is omitted.

While the form of embodiment of the invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted, as may come within the scope of the claims which follow.

What is claimed is as follows:

1. A dishwashing machine including a cabinet having walls enclosing a dishwashing compartment, means for supplying a washing liquid to said compartment, a motor, the bottom wall of said compartment being provided with a discharge outlet, a refuse shredder and a pump in said discharge outlet directly connected to said motor, the inlet of said pump being connected to the outlet of said shredder, said pump being provided with a two way outlet provided with a two Way valve, a spray means in said compartment connected to one branch of said outlet and a drain connection connected to the second branch of said outlet.

2. A dishwashing machine including a cabinet having walls enclosing a dishwashing compartment, means for i q ,1 3 discha 'ge outlet direg .o ungt cte said moltpr the inlet of said pump being connected to the'outlt of said shredder, said pump being provided with a two way outlet provided with a two way valve, a spray means in said compartment connected to one branch of said outlet and a drain connection connected to the second branch of said outlet, a sequential timed control device having means connected to said supply means and said motor and said valve means to open said supply means, energize said motor and operate said valve to connect said pump to said drain, subsequently to operate said valve to connect said pump to said spray means and close said supply means, and later to operate said valve to connect said pump to said drain.

3. A dishwashing machine including a cabinet having walls enclosing a dishwashing compartment, means for supplying a washing liquid to said compartment, a motor, the bottom wall of said compartment being provided with a discharge outlet, a refuse shredder and a pump in said discharge outlet directly connected to said motor, the inlet of said pump being connected to the outlet of said shredder, said pump being provided with a two way outlet provided with a two way valve, a spray means in said compartment connected to one branch of said outlet and a drain connection connected to the second branch of said outlet, a sequential timed control device having means connected to said supply means and said motor and said valve means to open said supply means, energize said motor and operate said valve to connect said pump to said drain, subsequently to operate said valve to connect said pump to said spray means and close said supply means, and later to operate said valve to connect said pump to said drain, said control device having means to finally open said supply means, energize said motor and operate said valve to connect said pump to said drain.

4. A dishwashing machine including a dishwashing container, means for spraying a washing liquid into said dishwashing container, the bottom wall of said container being provided with discharge outlet means, a refuse shredder and a pump connected to said discharge outlet means, a motor for operating said shredder and said pump, conduit means connecting the outlet of said pump to said spraying means and to a drain, means for supplying cold and hot liquid to said container, valve means for c0ntrolling the flow through said conduit means either to the spraying means or to the drain, a sequential timed control device having means connected to said supply means and said motor and said valve means to provide a supply of cold liquid to said container and operating said motor and opening said conduit means to the drain for disposing of food wastes and providing a supply of hot liquid to said container and closing said conduit means to the drain and operating said motor to recirculate the liquid through the spray means to wash dishes.

5. A dishwashing machine including a dishwashing container, means for spraying a washing liquid into said dishwashing container, the bottom wall of said container being provided with discharge outlet means, a refuse shredder and a pump connected to said discharge outlet means, a motor for operating said shredder and said pump, conduit means connecting the outlet of said pump to said spraying means and to a drain, means for supplying cold and hot liquid to said container, valve means for controlling the flow through said conduit means either to the spraying means or to the drain, a sequential timed control device having means connected to said supply means and said motor and said valve means to provide a supply of cold liquid to said container and operating said motor and opening said conduit means to the drain for disposing of food wastes and providing a supply of References Cited in the file of this patent hot liquid to said container and closing said conduit means to the drain and operating said motor to recirculate the UNITED STATES PATENTS liquid through the spray means to wash dishes and sub- 1,528,069 Merseles Mar. 1925 sequently opening said conduit means to the drain and T r 2,286,520 Tranbarger June 16, 1942 finally termmatms the hquld pp 0 2,418,366 Powers APL 1, 1947 2,575,704 Clark Nov. 20, 1951 2,629,390 Walker Feb. 24, 1953 

